文档介绍:HowScienceHasChangedtheWorldWeLiveinObservationlifeWhatchangeshavemoderntechnologybroughttoourlife?,Andwecanhardlyleaveit。So,Ican'thelpwondering,howwasthetelephoneinvented?TheemergenceofmobilephonesOnedayinApril1973,amanstandingonthestreetsofNewYork,tookoutawirelessphoneabouttwobigbricksize,andMadeaphonecall,attractedtheattentionofpassers-,-,,theresearcherscanonlyputitontheshelfinthelaboratory,,,theweightof3kg,veryheavyandinconvenient,theusershouldcarryitlikeabackpacktocarryittowalk,soitiscalledtheshoulderbackphone".